“Problem saving your encryption key. Try again later.”
Hello @vjsxytfbsz! Thanks for reaching out. What is the browser you are using for Day One on the web? May we have you try signing out of your account, clear website data, sign back in and try one more time?
This guide has some tips to make sure the entire key is being copied from the mobile device (or Mac): https://dayoneapp.com/guides/day-one-on-the-web/getting-started-on-the-web/#adding-your-encryption-key
Let us know if that helps or if we can assist you further.